143 lines
6.2 KiB
Python
Executable File
143 lines
6.2 KiB
Python
Executable File
from Crypto.Cipher import AES
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import secrets
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import time
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import binascii # 引入hexlify方法
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class AES_CTR_DRBG:
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def __init__(self, personalization_string: bytes = b"", nonce: bytes = b""):
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self.keylen = 16 # AES密钥长度为128比特
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self.blocklen = 16 # AES块大小为128比特
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self.seedlen = 32 # 种子长度为256比特
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self.outlen = 16 # 输出长度为128比特
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# 重播种计数器，表明自初始化或者重播种期间获得新的熵输入依赖，请求随机数生成的次数
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self.reseed_counter = 0
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# 重播种计数器阈值，在重播种之前能够产生随机数的最大请求次数
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# level 1 2^20次
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# level 2 2^10次
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self.reseed_interval_in_counter = 1 << 30
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# 重播种时间阈值，距离上一次重播种的最大时间间隔，单位 秒
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# level 1 600s
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# level 2 60s
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self.reseed_interval_in_time = 6000
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# 最小的熵输入长度
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self.min_entropy_input_length = 32 # 256比特
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# 最大的熵输入长度
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self.max_ectropy_input_length = 1 << 35 - 1 # 2^35比特
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self.seed_material = ""
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self.aes = AES.new(b"\x00" * self.keylen, AES.MODE_ECB)
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self.AES_CTR_DRBG_Instantiate(personalization_string, nonce)
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def AES_CTR_DRBG_Instantiate(
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self, personalization_string: bytes = b"", nonce: bytes = b""
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):
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self.min_entropy = self.seedlen
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self.entropy_input = secrets.token_bytes(self.min_entropy)
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self.seed_material = self.entropy_input + nonce + personalization_string
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self.seed_material = self.AES_CTR_DRBG_df(self.seed_material, self.seedlen)
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self.Key = self.seed_material[: self.keylen]
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self.V = self.seed_material[-self.blocklen :]
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self.reseed_counter = 1
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self.last_reseed_time = int(time.time())
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def AES_CTR_DRBG_Update(self, seed_material, Key, V):
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temp = b""
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while len(temp) < len(seed_material):
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self.V = (int.from_bytes(self.V, "big") + 1) % (1 << (8 * self.blocklen))
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self.V = self.V.to_bytes(self.blocklen, "big")
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temp += self.aes.encrypt(self.V)
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temp = temp[: len(seed_material)]
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temp = int.from_bytes(temp, "big") ^ int.from_bytes(seed_material, "big")
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temp = temp.to_bytes(len(seed_material), "big")
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self.Key = temp[: self.keylen]
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self.V = temp[-self.blocklen :]
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def AES_CTR_DRBG_df(self, input_string: bytes, number_of_bits_to_return: int):
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L = len(input_string).to_bytes(4, "big")
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N = number_of_bits_to_return.to_bytes(4, "big")
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S = L + N + input_string + b"\x80"
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while len(S) % self.blocklen != 0:
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S += b"\x00"
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temp = b""
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i = 0
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K = b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F"[
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: self.keylen
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]
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while len(temp) < self.keylen + self.outlen:
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IV = i.to_bytes(4, "big") + b"\x00" * (self.blocklen - 4)
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temp += self.CBC_MAC(K, IV + S)
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i += 1
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K = temp[: self.keylen]
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X = temp[self.keylen : self.keylen + self.outlen]
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tmp = b""
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while len(tmp) < number_of_bits_to_return:
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X = self.aes.encrypt(X)
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tmp += X
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requested_bits = tmp[:number_of_bits_to_return]
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return requested_bits
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def CBC_MAC(self, Key, data_to_MAC):
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chaining_value = b"\x00" * self.blocklen
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for i in range(0, len(data_to_MAC), self.blocklen):
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block = data_to_MAC[i : i + self.blocklen]
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input_block = int.from_bytes(chaining_value, "big") ^ int.from_bytes(
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block, "big"
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)
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chaining_value = self.aes.encrypt(
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input_block.to_bytes(self.blocklen, "big")
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)
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return chaining_value
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def AES_CTR_DRBG_Reseed(self, additional_input: bytes):
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self.min_entropy = self.seedlen
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self.entropy_input = secrets.token_bytes(self.min_entropy)
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self.seed_material = self.entropy_input + additional_input
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self.seed_material = self.AES_CTR_DRBG_df(self.seed_material, self.seedlen)
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self.AES_CTR_DRBG_Update(self.seed_material, self.Key, self.V)
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self.reseed_counter = 1
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self.last_reseed_time = int(time.time())
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def AES_CTR_DRBG_Generate(
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self, requested_number_of_bits, additional_input: bytes = b""
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):
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length = requested_number_of_bits // 8
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returned_bits = b""
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if (
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self.reseed_counter > (1 << 48)
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or int(time.time()) - self.last_reseed_time > 600
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):
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self.AES_CTR_DRBG_Reseed(additional_input)
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if additional_input != b"":
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additional_input = self.AES_CTR_DRBG_df(additional_input, self.seedlen)
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self.AES_CTR_DRBG_Update(additional_input, self.Key, self.V)
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else:
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additional_input = b"\x00" * self.seedlen
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while len(returned_bits) < length:
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self.V = (int.from_bytes(self.V, "big") + 1) % (1 << (8 * self.blocklen))
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self.V = self.V.to_bytes(self.blocklen, "big")
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output_block = self.aes.encrypt(self.V)
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returned_bits += output_block
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self.AES_CTR_DRBG_Update(additional_input, self.Key, self.V)
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self.reseed_counter += 1
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return returned_bits[:length]
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if __name__ == "__main__":
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bit_len = int(input("Enter the length of the bit string to be generated(bit):"))
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num = int(input("Enter the number of the bit string to be generated:"))
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file_name = input("Enter the name of the saved file:")
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start_time = time.time() # 记录开始时间
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aesDrbg = AES_CTR_DRBG()
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with open(file_name, "w") as f: # 改为以文本方式写入
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for i in range(num):
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hex_output = binascii.hexlify(
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aesDrbg.AES_CTR_DRBG_Generate(bit_len)
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).decode() # 转为十六进制并解码为string
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f.write(hex_output + "\n") # 在每次写入后换行
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end_time = time.time() # 记录结束时间
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elapsed_time = end_time - start_time # 计算经过的时间
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print(f"running time: {elapsed_time} ") # 打印出运行时间
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